Etc.
Also, quests of epic proportion (A+ or S level) tend to be linked to those special areas.

In fact, the 10 restricted areas are deadly to any player who attempts to venture inside them. Even Plains of Despair cannot compare to a forbidden zone in terms of level and danger.

The regular wandering monster in those areas are often equivalent to high level boss monster in another area, if not beyond boss class level monsters of standard dungeons. To add insult to injury, there are no special limitations to the number of high level monsters in those regions either.

The exploration of these areas started only recently in Volume 18, and again in Volume 26.

It is located deeply within the mountain range in the Central Continent, with concentration of terrifying flying monsters. There was virtually no information on Argoldia. It was vastly different compared to Grapass. "It is a desolate landscape of where it was impossible for even a blade of grass to grow" [5].

First mention was made by the Bishop of the Church of Lugh. Once, the Church of Lugh maintained a sanctum there but the Magicians of Dark Wood released Chimeras and monsters, making the region uninhabitable" [7].

A quest was by the Church of Lugh to restore their holy artifact: the Sword of Lugh. The expedition was led by a user named Spenson [8].

The magicians of Dark Wood are all senior magicians of level 460+. And near their territory, teleport magic cannot be used [9].

Appearance: When Weed decided to flee the Munoji Castle with Seoyoon, through an abandoned portal[13], during his legendary time-sculpting skill quest (also called Nodule and Hilderun historical quest).

Climate: A quiet and very dry desert (...) "where human like lifeforms couldn’t live". In fact, the heat of the Desert of Tranquillity burns away all mana so skills can’t be used.[14],

Geography: Endless red sand in the southern part of the Central Continent[15], with very few Oasis.

Tribes: Brukan Tribe

Monsters: Mostly none

Dungeons: Dungeon of the Fire Salamander King

History:

There were minimal users active in the desert. The environment is far too hot and painful with few monsters so only some people comes to the desert to complete quests. Lies in the hot sandy barren land is where the legendary oasis hidden by the Goddess Petra were Hestiger end his journey there in his pursuit to find his Great Emperor Weed after the Pallos Empire founded and Weed completing his Sculpting Master Quest.

Also named gray pass[17]. Was visited by Weed, on his quest to meet Zahab [18].

Grapass was located within Aidern Kingdom on the Central Continent[19]. Many hunting parties went to Grapass to get the magic seals and jewels from monster's drop. After completing his quests and Zahab was ready to go out exploring the world, Weed asked him to come hunting with him.[20]. They decimated dungeon after dungeon with Zahab's help. Inside Zahab's workshop there were still some sculptures left (Zahab only took about 80% of his sculptures), it is unknown if Weed took it back to the Art Center or not after Zahab left.

the land of Jigolaths, a land that has not been tread on by any man (...)" since the fall of the old Empire[23]. It is in fact an island[24]. The first zone was explored by Weed, followed by the Hermes guild.

The name Las Phalanx came from an attempt by a translator to convert "Jigolaths" into its English equivalent. The Korean name of Jigolaths uses characters meaning "hand" and "bone", and "hand bones" are "phalanges" in English. To add a bit of flair, "phalange" was then morphed into "Las Phalanx".

Geography: It is a huge and endless maze that connects the Central Continent to the Western Continent[26]. If you were not careful and equipped for it, as a gamer, entering this place would means your character would endlessly wander there until it died.

Monsters:

Dungeons:

It was also rumored that legendary swords or armours were buried there along with many treasures.